linux-kernel - Re: [RFC PATCH]debugfs:Fix terminology inconsistency of dir name to mount debugfs filesystem.

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Message-ID: <49b7c2350905261924h34e5f019g9e38735bb64bbf87@mail.gmail.com>
Date:	Wed, 27 May 2009 11:24:50 +0900
From:	GeunSik Lim <leemgs1@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Greg KH <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>, trivial@...nel.org,
	balagi@...tmail.de, bgamari@...il.com, Ingo Molnar <mingo@...e.hu>,
	inaky.perez-gonzalez@...el.com
Subject: Re: [RFC PATCH]debugfs:Fix terminology inconsistency of dir name to 
	mount debugfs filesystem.

On Wed, May 27, 2009 at 6:15 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Tue, 26 May 2009, Greg KH wrote:
>> >
>> > The filesystem Nazi's out there will argue that the proper place to mount
>> > the debugfs filesystem is /sys/kernel/debug. I personally find that
>> > location annoying.
>>
>> Why?
>
> Because it is too much to type ;-)
I think so. But, when we consider many developers that use linux kernel
source all over the world, I think that a regular rules or consistency
is important
as greg k-h explained.

Recently, I read "ftrace-world.odp" presentation file  of steven rostedt.

For example, about Mounting debugfs...
#> mount -t debugfs nodev /sys/kernel/debug
OR
#> mkdir /debug
#> mount -t debugfs nodev /debug

I want that we will reach a consensus about mount directory name of
debugfs filesystem to avoid confusing among the kernel developers.

/debug/ ?
or   /sys/kernel/debug/?
 .....

Frankly speaking, I like /sys/kernel/debug/ rule is better than /debug/ rule
for consistency.

>
>>
>> When I created debugfs, I was told that I had to pick a place to mount
>> it so that everyone could write scripts that "knew" where it would be.
>>
>> So we picked /sys/kernel/debug/ and the code creates the mount point to
>> put it there.  Now distros actually mount debugfs at that location.
>>
>> So, now you don't like this?  After it's become a standard?  Ick.
>>
>> Becides, /debug/ is pretty presumptious, it's as if debugging the kernel
>> is a system-wide thing :)
>>
>> So please, don't use /debug/ use the standard, defined, and ACTUALLY
>> USED BY DISTROS TODAY mount point of /sys/kernel/debug/
>>
>> If you want to create your own symlink from /debug/ to that location to
>> make it easier to type, feel free, but do not hard code any scripts to
>> use that location, or they are going to break.
>
> All my scripts search /proc/mounts to find where debugfs is mounted, then
> it uses that.
>
> Hmm, Not sure what packages in the distros use the default. I don't see
> the debugfs in /etc/fstab in any of my machines.
>
Yes.. In my case, I use linux distributions like Ubuntu 8.10, Fedora
9/10, CENTOS 5.3 currently. This distributions  use proc , tmpfs,
devpts, sysfs for official release
by default.

> -- Steve
>
>



-- 
Regards,
GeunSik Lim
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